AdMatic: documenting monetixads alias (prebid#5387)

* added simple params

* update

* Update admatic.md

* update

* update

* Pixad Bid Adapter: added simple params

* AdMatic Adapter: Feature update

Pixad alias is included in the update.

* Update admatic.md

* Update pixad.md

* gvl_id add

* Update pixad.md

* admatic && pixad pbs support true

* Create monetixads.md

dev-docs/bidders/monetixads.md

@@ -0,0 +1,91 @@
+---
+layout: bidder
+title: Monetix Ads
+description: Prebid Monetix Bidder Adapter.
+pbjs: true
+pbs: true
+biddercode: monetixads
+media_types: banner,video,native
+gvl_id: 1281 (admatic)
+tcfeu_supported: true
+usp_supported: true
+coppa_supported: true
+gpp_sids: tcfeu, tcfca, usnat, usstate_all, usp
+schain_supported: true
+dchain_supported: false
+userIds: criteo, id5Id, sharedId, unifiedId
+safeframes_ok: true
+floors_supported: true
+aliasCode: admatic
+multiformat_supported: will-bid-on-any
+sidebarType: 1
+---
+
+### Description
+
+Monetix Ads header bidding adapter connects with Monetix Ads demand sources to fetch bids for network ID. Please reach out to your account manager or <team@monetixads.com> for more information.
+
+### Bid params
+
+{: .table .table-bordered .table-striped }
+| Name        | Scope    | Description                         | Example  | Type     |
+|-------------|----------|-------------------------------------|----------|----------|
+| `networkId` | required | The network ID from Monetix Ads | `12345` | `number` |
+| `host` | required | RTB Host | `rtb.network.monetixads.com` | `string` |
+
+### Test Parameters
+
+300x250 banner test
+
+```javascript
+var adUnits = [{
+  code: 'your-slot_1-div',
+  mediaTypes: {
+    banner: { sizes: [[300, 250]] },
+  },
+  bids: [{
+      bidder: 'monetixads',
+      params: { 
+          networkId: 12345,
+          host: 'rtb.network.monetixads.com'
+      }
+  }]
+},{
+  code: 'your-slot_2-div',
+  mediaTypes: {
+    native: { ... },
+  },
+  bids: [{
+      bidder: 'monetixads',
+      params: { 
+          networkId: 12345,
+          host: 'rtb.network.monetixads.com'
+      }
+  }]
+},{
+  code: 'your-slot_3-div',
+  mediaTypes: {
+    video: { ... },
+  },
+  bids: [{
+      bidder: 'monetixads',
+      params: { 
+          networkId: 12345,
+          host: 'rtb.network.monetixads.com'
+      }
+  }]
+}];
+```
+
+## UserSync example
+
+```javascript
+pbjs.setConfig({
+  userSync: {
+    iframeEnabled: true,
+    syncEnabled: true,
+    syncDelay: 1,
+    aliasSyncEnabled: true
+  }
+});
+```